PYQ Vault
EbooksTutor

Day 226: JEE Mains Physics

5 questions. Try each one first, then open its answer.

  1. Question 1

    Electrostatics. Asked once: 23 Jan 2025 (same type asked 2 times) See all 2 of this type

    77
    Two charges 7μc7\mu c and −4μc- 4\mu c are placed at (−7 cm( - 7\text{ }cm, 0,0 ) and ( 7 cm,0,07\text{ }cm,0,0 ) respectively. Given, ϵ0=8.85×10−12C2 N−1 m−2\epsilon_{0}= 8.85 \times10^{- 12}C^{2}{\text{ }N}^{- 1}{\text{ }m}^{- 2}, the electrostatic potential energy of the charge configuration is :

    Tap an option to check your answer.

  2. Question 2

    Kinetic Theory. Asked once: 8 Apr 2023 (same type asked 2 times) See all 2 of this type

    18
    An air bubble of volume 1 cm31{\text{ }cm}^{3} rises from the bottom of a lake 40 m40\text{ }m deep to the surface at a temperature of 12∘C12^{\circ}C. The atmospheric pressure is 1×105 Pa1 \times10^{5}\text{ }Pa, the density of water is 1000 kg/m31000\text{ }kg/m^{3} and g=10 m/s2g = 10\text{ }m/s^{2}. There is no difference of the temperature of water at the depth of 40 m40\text{ }m and on the surface. The volume of air bubble when it reaches the surface will be

    Tap an option to check your answer.

  3. Question 3

    Nuclei. Asked once: 24 Jan 2023 (same type asked 2 times) See all 2 of this type

    113
    The energy released per fission of nucleus of  240X\ ^{240}X is 200MeV200MeV. The energy released if all the atoms in 120 g120\text{ }g of pure  240X\ ^{240}X undergo fission is n×1025MeVn \times10^{25}MeV. The value of nn is ____\_\_\_\_. (Given NA=6×1023N_{A}= 6 \times10^{23})

  4. Question 4

    Electromagnetic Induction. Asked once: 29 Jan 2024 (same type asked 2 times) See all 2 of this type

    112
    A horizontal straight wire 5 m5\text{ }m long extending from east to west falling freely at right angle to horizontal component of earth's magnetic field 0.60×10−4Wbm−20.60 \times10^{- 4}Wbm^{- 2}. The instantaneous value of emf induced in the wire when its velocity is 10 ms−110{\text{ }ms}^{- 1} is ______ ×10−3 V\times10^{- 3}\text{ }V.

  5. Question 5

    Units and Measurements. Asked once: 28 Jun 2022 (same type asked 2 times) See all 2 of this type

    111
    A student in the laboratory measures thickness of a wire using screw gauge. The readings are 1.22 mm,1.23 mm,1.19 mmmm,1.23\text{ }mm,1.19\text{ }mm and 1.20 mm1.20\text{ }mm. The percentage error is x121%\frac{x}{121}\%. The value of xx is